In 5.x i would put each hosts local datastore into maintenance mode to prevent accidental deployment of files or VMs to the local datastore.
I do not seem to be able to do this - there is no option visible in the traditional and much loved client, and in the web client there is a menu option but it is greyed out and inactive?
Was this capability removed in ESXi 6?
The feature is available and not removed!
Maintenance mode is available to datastores within a Storage DRS-enabled datastore cluster. Standalone datastores cannot be placed in maintenance mode.
The situation is same for ESXi 5.1, 5.5 and 6.x.